Place a border around an image with ImageMagick

borderimg.sh

# Bash function to place a border around an image with ImageMagick
function borderimg() {
  if [ -z ${3} ]; then
    echo "Usage: borderimg <imageFile> <whiteBorderSize> <blackBorderSize>"
  else
    identify ${1}
    mogrify -border ${2}x${2} -bordercolor white ${1}
    mogrify -border ${3}x${3} -bordercolor black ${1}
    identify ${1}
  fi
}